@article {,
title = {Effect of Chinese Herb Extracts on Spore Germination of Qidium murrayae and Nature of Inhibitory Substance from Chinese Rhubarb},
journal = {Plant Disease},
number = {10003},
year = {2006},
month = {2006 / 7},
publisher = { },
abstract = {More than 21\% of the Chinese herbs tested contained substances in their aqueous extracts inhibitory to conidial germination of the powdery mildew fungus Oidium murrayae. Extracts from Chinese rhubarb and Japanese knotweed were very effective in controlling powdery mildew on cucumber, pumpkin, and eggplant. The inhibitory substance in Chinese rhubarb was soluble in polar solvents and less soluble in nonpolar solvents. The inhibitor in the aqueous extract was not dialyzable in the membrane tubing with molecular weight cut off 14000, but was exchangeable by anion but not cation exchange resins, indicating that the inhibitor has a molecular weight lager than 14000 and negative charge on its molecule.},
author = {何婉清}
}